1. Look at this link
2. Create your own map.
3. Create (or copy from real life maps) dot (for example "Chicago").
4. Click "View all sizes" on http://www.koinup.com/Anatoliy/work/348519/ (it is an example) and copy a picture in size "little" and paste to preferences this waypoint in your Google map (before you should click "edit" on your map). After that copy and paste the link which is given at this point
5. Click "save" on the your map.
You can create (or edit) public maps or maps for your friends.
It's wonderful. See my Anatoliy's map